Heat insulating container



June 23, 1953 E. FREEDMAN HEAT INSULTING CONTAINER *Filed 'ay 24, 1950Patented June 23, 1953 HEAT INSULATING CONTAINER Ephraim Freedman,,Broeklyn N. Y., assisnornf Aone-half to :Ezekiel J. J accarooklyn, kNY.

,Application'May 24, 1950, Seria1.Nc.164,09

4 Qlailns.. 1

The present invention relates to a heat im sulating container, and moreAparticularly to an unbreakable heat insulating container which may havelthe shape of a bottle, ask, jug, pitcher, ice bucket, barrel,refrigerator box, shipping case or the like.

It is an object of the present invention to provide an unbreakablecontainer of the kind described which Iholds the contents thereof atsubstantially the same thermal condition for an eX- tended period oftime.

An unbreakable heat insulating container according to the presentinvention comprises in combination, an outer jacket, an inner jacketarranged inside and spaced apart from the outer jacket, the jacketsdefining a gap between themselves, a first layer arranged on the innersurface of the outer jacket so -as to cover substantially the entireinner surface ofthe outer jacket, and a second layer arranged on theouter surface of the inner jacket so as to cover substantially'theentire outer surface of the inner jacket, the outer jacket and the firstlayer consisting one of a plastic material and the other of agas-impermeable material, the inner jacket and the second vlayerconsisting one -of a, plastic `Inaterial andthe other of agas-impermeable material.

An embodiment of the present invention comprises an outer jacketconsisting of a plastic material, an inner jacket consisting of aplastic material and arranged inside and spaced apart from the outerjacket, the `jacketsdening a gap between themselves, a first layerconsisting of a gas-impermeable material and arranged on the innersurface of the outer jacket so .as to .cover substantially the entireinner surface of the outer jacket, and a second layer consisting of agasimpermeable material and arranged on the outer surface of the innerjacket so as to cover substantially the entire outer surface of theinner jacket.

Preferably the layers are spaced apart from each other in the gapVdefined by the jackets. Preferably the layers define a space lbetweenthem which is evacuated.

In preferred embodiment yof the present invention polyethylene is usedas a plastic material for the inner and outer jacket.

In a preferred embodiment of the present invention the gas-impermeablematerial of which the layers consist is ametal, preferably aradiation-reccting one.

Another embodiment of the present invention comprises in combination, anouter jacket consisting of a solid gas-impermeable sheet ma- 2 terial, afirst llayer consisting of a plastic material and arranged on the insideof the outer jacket so as to cover substantially the entire innersurface of the outer jacket, an inner jacket consisting of a solidgas-impermeable sheet material `arranged inside and spaced apart fromthe first layer, and a second layer consisting of a plastic material andarranged on the outside of the inner jacket so as to cover substantiallythe entire outer surface of the inner jacket, the first and secondlayers being spaced apart and dening an evacuated gap betweenthemselves.

Preferably in this embodiment of the present invention radiationreflecting layers are arranged, respectively, on the inner side of thefirst layer and on the outer side of the second layer.

Preferably in this embodiment of the present invention a third layerconsisting of a material having an appreciably lower heat conductivitythan the outer jacket is arranged on the outside of the outer jacket soas to cover substantially the entire outer surface of the outer jacketwhereas a fourth layer consisting of a material having an appreciablylower heat conductivity than the inner jacket is arranged on the insideof the inner jacket so as to cover substantially the entire surface ofthe inner jacket.

Preferably in this embodiment of the invention the solid gasimpermeablesheet material for the outer and inner jackets consists of metal. Theplastic material of which the rst layer and second layer consist ispolyethylene which may also be used for the material lhaving anappreciably Vlower heat conductivity than the inner jacket or outerjacket, respectively.

The novel features which are considered as characteristic for theinvention are set forth in particular the appended claims. The inventionitself, however, both as to its construction and its method ofoperation, together with additional Vobjects and advantages thereof,will be best understood from the following Vdescription of specificembodiments when read in connection with the accompanying drawings, inwhich:

Fig. 1 isa section through a rst embodiment of the .present invention;and

Fig. I2 is a partial section at an enlarged scale through a secondembodiment of the present invention.

Referring now to the drawings and first to Fig. 1, acontainer is shownhaving the shape of a thermos `flask which, however, is not meant as alimiting feature of the Ypresent invention. The container consists of anouter jacket I consisting of a plastic .material such as polyethyleneand an inner jacket I2 consisting of a plastic material such aspolyethylene. Ihe inner jacket I2 is arranged inside and spaced apartfrom the outer jacket I0. At the top I4 the outer jacket I!! and theinner jacket I2 merge into each other. The jackets I and I2 define a gapI6 between themselves which is partly filled by a first layer I8consisting of a gas-impermeable material such as metal :and arranged onthe inner surface of the outer jacket I0 so as to cover substantiallythe entire surface of the outer jacket. A second layer consisting of agas-impermeable material such as metal is :arranged on the outer surfaceof the inner jacket I2 so as to cover substantially the entire outersurface of the inner jacket. The layers IB and 20 are spaced apart fromeach other in the gap I6 defined by the jackets I0 and I2 so as todefine a space between the layers I8 and 20, which is evacuated. Theinner surface of the metal layer I8 and the outer surface of the metallayer 20 may be reflecting surfaces for radiation; for instance themetal may be silver or chromium and its surface may be polished to ahigh degree.

Referring now to Fig. 2 showing at an enlarged scale a wall portion of asecond embodiment according to this invention an outer layer 22consisting of a solid gas-impermeable sheet material, for instancemetal, carries a first layer 2E. consisting of a plastic material such:as polyethylene and arranged on the inside of the outer jacket 22 so asto cover substantially the entire inner surface of the outer jacket.Furthermore, the container comprises an inner jacket 26 consisting of :asolid gas-impermeable sheet material such as metal which is arrangedinside and spaced apart from the first layer 24 and carries a secondlayer 28 consisting of a plastic material such as polyethylene andarranged on the outside of the inner jacket 26 so as to coversubstantially the entire outer surface of the inner jacket. The firstlayer 2d and the second layer 28 :are spaced apart and define a gap 30between themselves which may be evacuated. Radiation reflection layers32 and 34 are arranged, respectively, on the inner side of the firstlayer 24 and on the outer side of the second layer 28. These layers 32and 3d consist preferably of metal such as silver or chromium having ahighly polished surface. On the outside of the outer layer 22 and theinside of the inner layer 26 are arranged, respectively, third andfourth layers 36 and 38 consisting of a material having an appreciablylower heat conductivity than the outer jacket 22 and the inner jacket26. -If the jackets 22 'and 2S consist of metal the layers and 38 aremade preferably of polyethylene.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofheat insulating containers, differing from the types described above.

While I have illustrated and described the invention as embodied in anunbreakable heat insulating container, l do not intend to be limited tothe details shown, since variations, modifications and structuralchanges may be made without departing in any way from the spirit of myinvention.

Without further analysis, the foregoing will so fully reveal the gist ofmy invention that others can by applying current knowledge readily adaptit for various applications without omitting features that, from thestandpoint of prior art, fairly constitute essential characteristics ofthe generic or specific aspects of this invention and, therefore, suchadaptations should and :are intended to be comprehended within themeaning and range of equivalence of the following claims.

What I claim as new and desire to secure by Letters Patent is:

1. An unbreakable heat insulating container comprising in combination,an outer jacket consisting of a solid gas-impermeable sheet material; afirst layer consisting of a plastic material and arranged on the insideof said outer jacket so as to cover substantially the entire innersurface of said outer jacket; an inner jacket consisting of a solidgas-impermeable sheet material arranged inside and spaced apart fromsaid first layer; a second layer consisting of a plastic material andarranged on the outside of said inner jacket so as to coversubstantially the entire outer surface of said inner jacket, said firstand second layers being spaced apart and defining an evacuated gapbetween themselves; a third layer consisting of a material having anappreciably lower heat conductivity than said outer jacket and arrangedon the outside of said outer jacket so as to cover substantially theentire outer surface of said outer jacket; and a fourth layer consistingof a material having an 'appreciably lower heat conductivity than saidinner jacket and arranged on the inside of said inner jacket so as tocover substantially the entire inner surface of said inner jacket.

2. An unbreakable heat insulating container comprising in combination,an outer jacket consisting of a solid gas-impermeable sheet material; afirst layer consisting of a plastic material and arranged on the insideof said outer jacket so as to cover substantially the entire innersurface of said outer jacket; an inner jacket consisting of a solidgas-impermeable sheet material arranged inside and spaced apart fromsaid rst layer; a second layer consisting of a plastic material andarranged on the outside of said inner jacket so as to coversubstantially the entire outer surface of said inner jacket, said firstand second layers being spaced apart and dening an evacuated gap betweenthemselves; a third layer consisting of a material having an appreciablylower heat conductivity than said outer jacket and arranged on theoutside of said outer jacket so as to cover substantially the entireouter surface of said outer jacket; a fourth layer consisting of amaterial having an appreciably lower heat conductivity than said innerjacket and arranged on the inside of said inner jacket so as to coversubstantially the entire inner surface of said inner jacket; andradiationreflecting layers arranged, respectively, on the inner side ofsaid first layer and on the outer side of said second layer.

3. An unbreakable heat insulating container comprising in combination,an outer jacket consisting of metal; a first layer consisting ofpolyethylene and arranged on the inside of said outer jacket so as tocover substantially the entire inner surface of said outer jacket; aninner jacket consisting of metal arranged inside and spaced apart fromsaid first layer; a second layer consisting of polyethylene and arrangedon the outside of said inner jacket so as to cover substantially theentire outer surface of said inner jacket, said first and second layersbeing spaced apart and defining an evacuated gap between themselves; athird layer consisting of polyethylene and arranged on the outside ofsaid outer jacket so as to cover substantially the entire outer surfaceof said outer jacket; and a fourth layer consisting of polyethylene andarranged on the inside of said inner jacket so as to cover substantiallythe entire inner surface of said inner`V jacket.

' 5 4. An unbreakable heat insulating container comprising incombination, an outer jacket consisting of metal; a first layerconsisting of polyethylene and arranged on the inside of said outerjacket so as to cover substantially the entire 1D inner surface of saidouter jacket; an innerjacket consisting of metal arranged inside andspaced apart from said iirst layer; a second layer consisting'ofpolyethylene and arranged on the outside of said inner jacket so as tocover sube 15 stantially the entire outer surface of said inner jacket,said first and second layers being spaced apart and dening an evacuatedgap between themselves; a third layer consisting of poly,

ethylene and arranged on the outside of said 20 outer jacket so as tocover substantially the entire outer surface of said outer jacket; afourth layer consisting of polyethylene and arranged on the inside ofsaid inner jacket so as to cover substantially the entire inner surfaceof said inner jacket; and radiation-reilecting layers arranged,respectively, on the inner side of said rst layer and on the outer sideof said second layer.

EPHRAIM FREEDMAN.

References Cited in the le of this patent UNITED STATES PATENTS

